package com.mmall.service.impl;

import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.mmall.common.ServerResponse;
import com.mmall.dao.CategoryMapper;
import com.mmall.pojo.Category;
import com.mmall.service.ICategoryService;
import com.sun.corba.se.spi.activation.Server;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
import java.util.Set;

/**
 * Created by Steven.Lu on 2018/7/12.
 */
@Service("iCategoryService")
public class CategoryServiceImpl  implements ICategoryService{

    private Logger logger= LoggerFactory.getLogger(CategoryServiceImpl.class);

    @Autowired
    private CategoryMapper categoryMapper;

    public ServerResponse addCategory(String categoryName,Integer parentId){
        if(parentId ==null || StringUtils.isBlank(categoryName)){
            return   ServerResponse.createByErrorMessage("添加品类参数错误!");
        }

        Category category=new Category();
        category.setName(categoryName);
        category.setParentId(parentId);
        category.setStatus(true);   //这个分类是可用的

        int rowCount=categoryMapper.insert(category);
        if(rowCount>0){
            return ServerResponse.createBySuccess("添加品类成功");
        }
        return ServerResponse.createByErrorMessage("添加品类失败");
    }

    public ServerResponse updateCaregoryName(Integer categoryId,String categoryName){
        if(categoryId ==null || StringUtils.isBlank(categoryName)){
            return   ServerResponse.createByErrorMessage("更新品类参数错误!");
        }

        Category category=new Category();
        category.setId(categoryId);
        category.setName(categoryName);
        int rowCount=categoryMapper.updateByPrimaryKeySelective(category);
        if(rowCount >0){
            return ServerResponse.createBySuccess("更新品类名字成功");
        }
        return ServerResponse.createByErrorMessage("更新品类名字失败");
    }

    public ServerResponse<List<Category>> getChildrenParallelCategory(Integer categoryId){
        List<Category> categoryList=categoryMapper.selectCategoryChildrenByParentId(categoryId);
        if(CollectionUtils.isEmpty(categoryList)){
            logger.info("未找到当前分类的子分类");
        }
        return ServerResponse.createBySuccess(categoryList);
    }

    /**
     * 递归查询本节点的Id和孩子节点的Id
     * @param categoryId
     * @return
     */
    public ServerResponse<List<Integer>> selectCategoryAndChildrenById(Integer categoryId){
        Set<Category> categorySet= Sets.newHashSet();
        findChildCategory(categorySet,categoryId);
        List<Integer> categoryIdList= Lists.newArrayList();
        if(categoryId !=null){
            for(Category categoryItem:categorySet){
                categoryIdList.add(categoryItem.getId());
            }
        }
        return ServerResponse.createBySuccess(categoryIdList);
    }
    ///递归算法，算出子节点
    public Set<Category> findChildCategory(Set<Category> categorySet,Integer categoryId){
        Category category=categoryMapper.selectByPrimaryKey(categoryId);
        if(category !=null){
            categorySet.add(category);
        }
        //查找子节点，递归算法，一定要有一个退出的条件
        List<Category> categoryList=categoryMapper.selectCategoryChildrenByParentId(categoryId);
        for(Category categoryItem:categoryList){
            findChildCategory(categorySet,categoryItem.getId());
        }
        return categorySet;
    }
}
